Research Article
Strength Level of Professional Elite Soccer Players after the COVID-19 Lockdown Period: A Retrospective Double-Arm Cohort Study
Table 3
Team B strength values before (pre) and after (post) quarantine period.
| | Pre | Post | Mean Difference | 95% CI | † | d‡ |
| Knee extensors | M | ±SD | M | ±SD | M | ±SD | | | | | Concentric peak torque | 241.91 | 46.05 | 238.29 | 47.35 | 3.62 | 67.03 | −24.68 | 31.93 | 0.79 | NA | Eccentric peak torque | 294.29 | 61.55 | 293.04 | 44.11 | 1.25 | 74.17 | −30.07 | 32.57 | 0.93 | NA |
| Knee flexors | | | | | | | | | | | Concentric peak torque | 148.75 | 24.91 | 144.75 | 24.34 | 4.00 | 34.77 | −10.68 | 18.68 | 0.57 | NA | Eccentric peak torque | 294.37 | 61.60 | 185.75 | 27.10 | 108.62 | 72.72 | 77.91 | 139.33 | <0.01 | 2.31 |
| HQ ratios | | | | | | | | | | | Conventional | 0.61 | 0.12 | 0.61 | 0.05 | −0.01 | 0.03 | −7.23 | 15.44 | 0.81 | NA | Functional | 1.22 | 0.36 | 0.78 | 0.10 | −0.44 | 0.01 | 11.27 | 21.48 | <0.01 | 3.44 |
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Mean (M); standard deviation (SD); confidence interval of 95% (CI); not applicable (NA); ∗difference statistically significant ( < 0.05); † alfa level < 0.05; and ‡ cohen d effect size. Bold measures showed statistical significancy. |